Hoisting mechanism



Dec. 24, 1929. c, 05 00: 1,740,706

HOISTING MECHANISM Original Filed July 16, 1924 Patented Dec. 24, 1929 UNITED STATES PATENT OFFICE CHARLES F. OSGOOD, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MA- CHINERY COMPANY/A CORPORATION OF MASSACHUSETTS HOISTING MECHANISM Application filed July 16', 1924, Serial No. 726,318. Renewed September 21, 1928.

' a-nisms.

It has for its obj act to provide an improved hoisting mechanism. A further object is to provide an improved hoisting mechanism of the double drum type wherein the driving motor therefor is disposed at one end thereof but in the particular form herein shown extends within one of the drums. Still another object is to provide improved means through which the hoist motor may drive the drums and which at the same time supports the drums, and more specifically supports the drums independently of each other.

In the accompanying drawings I have shown for purposesof illustration one-form which my invention may assume in practice.

In these drawings,

Fig. '1 is r-a longitudinal vertical section of the hoisting mechanism, the motor thereof being shown in elevation.

Fig. '2 is a vertical transverse section on line -2'2 of Fig. 1.

In the illustrative embodiment of my 1nverition I have shown the same "as comprismg a base 1 having atone end thereof a; standard 2 comprising a clamp having an internal periphery 3 adapted to engage the periphery of the casing of an electric motor l, said clamp being split as at Sand the adjacent ends thereof being drawn together and held as by a bolt 6. In the embodiment herein shown it is to'be noted that the motor is of-the reversible-electric type but that any suitable air type motor could be used. In either case, however, the motor casing projects .a substantial distance inwardly from t-he'standard 2 so as to-f'orm a suitable bearing support for the adjacent drum and to make the longitudinal dimension of'the hoist as short as possible. A hollow combined driving shaft and drum support? is rotatably mounted, as by a bearing '8, upon the inner end of the motorcasingd, the other end of the'memberi'being rotatably supported as in a bearing -9 carried in the combined gear casingand supporting standard 10. A drum 11 is keyed to the member 7 as at 12, the outer end of the drum 11 being rotatably mounted upon the periphery of the motor casing as by roller bearings 13. A suitable flange is carried by the drum 11 adjacent its outer end, upon which is formed a. usual brake drum 15; and with this brake drum l5 cooperates a suitable braking mechanism 16.

t is also to be noted that the drum 11 is supported upon the member 7 very close to the motor casing so as to permit a substantial bearing 17 to be formed on the member 7 to rotatably support a second drum 18. Suitable oil grooves and ports 19 are arranged in the bearing 17 and the sleeve 7 between the adjacent ends of bearing flanges 20. The outer end of this drum has a brake drum 21 similar to the drum 15 and likewise a cooperating braking mechanism 22. Also keyed to the member 7, but on the opposite side of the drum :18 to which the drum 11 is positioned, is a ratchet 23 whose teeth 24 have radial pawl engaging surfaces 25 and inclined cam surfaces 26 adapted to shift a pawl 27 reciprocably mounted between lugs 28 projecting inwardly from a member 29 rotatably supported upon the member 7 as by an annular flange '30. The member 29 also has an outer annular flange carrying on its inner side an internalvgear 31. It will thus be noted that the ratchet 23 is positively connected to the drum 11 as-through the memher 7. A second ratchet 32 is fixed to the drum 18 and disposed in the same radial plane as the ratchet 23. The teeth 34 of the ratchet 32 are reversely positioned with respect to the teeth 24 of the ratchet 23. The pawl 27 has opposed ratchet engagingsurfaces 35 and 36 adapted to engage respectively the teeth 24and 34, depending upon the direction of rotation 'ofthe gear 31.

The driving connections between the motor and the gear 31 comprise a shaft 37, preferably an extension of the armature shaft, rotatably mounted at its outer end in a bearing 38 supported within the hollow portion of the member 7. A pinion-39 fixed upon thefree end of the shaft 37 meshes with the gear 40 fixed to a shaft 41 rotatably mounted in bearings 42 and 43, the inner end of. theshaft 41 carrying a-second pinion 44 meshing with the internal gear 31.

In the operation of this embodiment of my invention it will be assumed that the motor is driven in a direction so that the pawl 27 and one of the teeth 24 will be positively engaged, thus causing positive rotation of the drum 11. When, however, it is desired to drive the drum 18, the motor will be reversed, whereupon the internal gear 31 will be driven in the reverse direction and consequently cause the pawl 27 to engage the cam surfaces 26 to thrust the same radially and allow the surface 36 to engage tooth 34, thus positively driving the drum 18 in a reverse direction. The cables surrounding the respective drums can be wound thereon in the same or opposite directions, depending upon the nature of the Work which itis in tended the hoisting mechanism shall do.

While I have in this application specifically described one form which my invention mayassume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the in vention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

WVhat I claim as new and desire to secure by Letters Patent is:

1. A hoisting mechanism comprising a plurality of winding drums each rotatable by power independently of the other, driving and supporting means therefor including rotatable concentric power shafts, one of said shafts providing a journal for one of said drums and being in fixed relation to another of said drums, a motor driving a second one of said shafts, andgearing connections between the said two shafts comprising a gear journaled on the first of said shafts.

2. A hoisting mechanism comprising a plurality of winding drums each rotatable by power independently of the other,'driving and supporting means therefor including rotatable concentric power shafts, one of said shafts providing afjournal for one of said drums and being in fixed relation to another of said drums, amotor driving a second one of SZIldshafts, gearing connections between the said two shafts comprising a gear jour--' nale'd on the first of said shafts, and means permitting alternative driving of said drums.

3. A hoisting mechanism comprising a plurality of concentric power transmission members, a pair of, winding drums, one of which has fixed relation to one of said members for rotation therewith and the other of which is freely rotatably supported, and means for alternatively driving said drums including reduction gearing between the inner of said.

concentric members and the outer one, an element of said reduction gearing being journaled on said outer one.

4. A hoisting mechanism comprising a base, a standard atone end thereof comprising a clamp, a motor carried by said standard and held by said clamp, said motor having a housing with a portion thereof extending be yond a side of said standard, a sleeve rotatably supported on said housing, a second standard rotatably supporting the outer end of said sleeve, a winding drum fixed to said sleeve and rotatably supported by and surrounding said motor, a second winding drum rotatably mounted upon said sleeve, and driving connections between said motor and drums including a driving shaft disposed within said sleeve and means driven thereby for driving said sleeve and the drum fixed thereto in one direction and for driving the second drum in the other direction.

5. In a hoist, a base supporting a motor casing and a gear casing in spaced'relation, a bearing being provided on the inner portion of the motor casing, a member journaled on said bearing comprising a winding drum with a projecting sleeve member, a bearing being provided by the gear casing for the outer end of the sleeve member, a second winding drum journaled on said sleeve member, and-means for driving said drums comprising a motor in said motor casing, gearing in said gear casing, and a driving shaft extending within said sleeve member between said motor and said gearing.

6. In a hoist, a base supporting a motor casing and a gear casing in spaced relation, a bearing being provided on the inner end of the motor casing, a member j ournaled on said bearing comprising a winding drum with a projecting sleeve member, a bearing being provided by the gear casingfor the outer end of the sleeve member, a second winding drum journaled on said sleeve member, and means for driving said drums comprising a motor in said motor casing, gearing in said gear casing, a driving shaft extending within said sleeve member betweenthe motor and the gearing, and a gear rotatable coaxially with said sleeve member anddriven by said gearing. I

7. A hoisting mechanism comprising a motor having a driving shaft and a stationary casing, a plurality of' relatively rotatable winding drums, operative driving connections between said shaft and said winding drums, and means for supporting said drums, said motor casing providing a support for said means independently of said drive shaft and said drums all'being disposed at one end of said motor with said stationary casing extending within the winding portion of one of said drums.

8. A hoisting mechanism comprising a base having spaced'standards, a motor carried wholly by one of said standards, a pair of relatively rotatable winding drums supported by said motor and said other standard, and operative driving connections between said motor and said drums, said drums being disposed adjacent each other between said motor and standard but said motor extendrotation.

In testimony whereof I afiix my signature.

CHARLES F. OSGOOD. 

